Free Online Calculators
1014+ engineering, math, physics, chemistry, biology, finance, health, statistics, and everyday calculators — all free, no signup required.
MegaCalc offers a comprehensive library of free online calculators covering engineering, science, mathematics, finance, and everyday use. Every calculator runs entirely in your browser — results appear instantly as you type, with no page reloads, no server round-trips, and no data stored or transmitted. All calculators support both metric (SI) and imperial unit systems, with unit selectors on every input field so you can work in the units your problem calls for.
The engineering calculators span the full undergraduate mechanical engineering curriculum: statics, dynamics, mechanics of materials, thermodynamics, fluid mechanics, heat transfer, machine design, materials science, and manufacturing. Each calculator implements the governing equation with clearly labeled variables, a step-by-step guide, and a formula reference — making these tools useful for both learning and professional practice.
What Calculators Are Available?
Statics
Force resolution, moments, centroids, trusses, and area moments of inertia.
Dynamics
Projectile motion, circular motion, work-energy, impulse-momentum, and gear ratios.
Mechanics of Materials
Stress, strain, Hooke's law, beam bending, torsion, buckling, and fatigue.
Thermodynamics
Ideal gas law, Carnot efficiency, Otto and Diesel cycles, Rankine cycle, and psychrometrics.
Fluid Mechanics
Reynolds number, Bernoulli, Darcy-Weisbach, pump power, orifice flow, and drag.
Heat Transfer
Conduction, convection, radiation, heat exchangers (LMTD and NTU), and fin efficiency.
Machine Design
Shaft design, bearing life, belt drives, spring design, bolt preload, and weld strength.
Materials Science
Hardness conversion, thermal expansion, stress-strain properties, and creep life.
Manufacturing
Machining parameters, turning operations, drilling, tolerance stack-up, and surface finish.
Finance
Mortgage, compound interest, sales tax, discount, and percentage calculators.
Health
BMI calculator and other health and fitness metrics.
Everyday
Age, tip, days between dates, pace, download time, and aspect ratio calculators.
Controls & Systems
Transfer functions, Bode plots, root locus, PID tuning, Routh-Hurwitz, Nyquist, state-space, and Z-transform.
Engineering Statistics
Normal and t-distributions, ANOVA, regression, chi-square, DOE, process capability, and Weibull analysis.
Mechanical Vibrations
Free and forced SDOF vibration, vibration isolation, critical speed, dynamic absorbers, FFT, and multi-DOF systems.
Electrical Circuits
Ohm's law, AC impedance, RLC circuits, transformers, motors, voltage dividers, and Wheatstone bridges.
Engineering Economics
Time value of money, NPV, IRR, depreciation, break-even, loan amortization, and rate of return.
Numerical Methods
Root finding, numerical integration, ODE solvers, curve fitting, matrix operations, and interpolation.
Measurement & Instrumentation
Uncertainty propagation, sensor calibration, SNR, strain gauges, thermocouples, and ADC resolution.